netdev - Re: [PATCH net-next v3 13/19] net: ravb: Set config mode in ndo_open and reset mode in ndo

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Date: Mon, 8 Jan 2024 22:28:08 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Claudiu <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<richardcochran@...il.com>, <p.zabel@...gutronix.de>,
	<yoshihiro.shimoda.uh@...esas.com>, <wsa+renesas@...g-engineering.com>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <geert+renesas@...der.be>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v3 13/19] net: ravb: Set config mode in ndo_open
 and reset mode in ndo_close

On 1/5/24 11:23 AM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> As some IP variants switch to reset mode (and thus registers content is
> lost) when setting clocks (due to module standby functionality) to be able
> to implement runtime PM and save more power, set the IP's operating mode to
> reset at the end of the probe. Along with it, in the ndo_open API the IP
> will be switched to configuration, then operation mode. In the ndo_close
> API, the IP will be switched back to reset mode. This allows implementing
> runtime PM and, along with it, save more power when the IP is not used.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
> 
> Changes in v3:
> - fixed typos in patch description
> - in ravb_probe() switch the hardware to reset mode just after phy
>   initialization
> 
> Changes in v2:
> - none; this patch is new
> 
> 
>  drivers/net/ethernet/renesas/ravb_main.c | 78 ++++++++++++++----------
>  1 file changed, 46 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 1cc1ecd8d6a8..434b4777de5e 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
[...]
> @@ -2746,11 +2755,6 @@ static int ravb_probe(struct platform_device *pdev)
>  	ndev->netdev_ops = &ravb_netdev_ops;
>  	ndev->ethtool_ops = &ravb_ethtool_ops;
>  
> -	/* Set AVB config mode */
> -	error = ravb_set_config_mode(ndev);
> -	if (error)
> -		goto out_rpm_put;
> -
>  	error = ravb_compute_gti(ndev);
>  	if (error)
>  		goto out_rpm_put;
> @@ -2785,13 +2789,23 @@ static int ravb_probe(struct platform_device *pdev)
>  		eth_hw_addr_random(ndev);
>  	}
>  
> +	/* Set config mode as this is needed for PHY initialization. */
> +	error = ravb_set_opmode(ndev, CCC_OPC_CONFIG);

   Hm... don't you need this at laest before calling ravb_read_mac_address()
just above?

> +	if (error)
> +		goto out_rpm_put;
> +
>  	/* MDIO bus init */
>  	error = ravb_mdio_init(priv);
>  	if (error) {
>  		dev_err(&pdev->dev, "failed to initialize MDIO\n");
> -		goto out_dma_free;
> +		goto out_reset_mode;
>  	}
>  
> +	/* Undo previous switch to config opmode. */
> +	error = ravb_set_opmode(ndev, CCC_OPC_RESET);
> +	if (error)
> +		goto out_mdio_release;
> +
>  	netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll);
>  	if (info->nc_queues)
>  		netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll);
[...]

MBR, Sergey